Inner drum exposure apparatus

[0033] In the following, the present invention will be described in detail with reference to the preferred embodiments shown in the attached drawings.

[0034]FIG. 1 is a perspective view schematically showing the configuration of an inner drum exposure apparatus according to an embodiment of the present invention. The characteristic feature of the inner drum exposure apparatus according to the embodiment under consideration is that, in order to allow the halftone to be represented with small dots using FM screening, two beam spots formed on the recording material by two parallel beam components, respectively, are combined into a synthetic beam spot in which the two beam spots are disposed side by side in a sub scanning direction (in the direction in which a spinner mirror unit 16 to be described later performs scanning) so as to overlap each other.

[0035] As shown in FIG. 1, an inner drum exposure apparatus 10 according to this embodiment includes as its base a support 12 having a shape